A benefit for a great public school in East Harlem attended by Sean's daughter and Elliott's son! XRP (Rockapella 1989-91) is ex-Rockapella members Sean Altman, Barry Carl, Elliott Kerman and Steve Keyes. Like the Iron Giant, reassembling itself out of its far-flung pieces by sheer will power, XRP comes together again to make the a cappella magic that lit up the screen when the now-famous "Spike Lee & Co. Do It A Cappella" documentary was debuted on PBS-TV in 1990. Before there was Carmen Sandiego, these four men, the classic members of Rockapella — Sean Altman, Steve Keyes, Elliott Kerman and Barry Carl — were putting their indelible stamp on vocal harmony and inspiring a wave of enthusiasm for a cappella that would sweep the globe. Now they're back together as XRP for a once (or maybe every few years when they forget that they've already reunited) in a lifetime event, making the music that made them famous as America's premier vocal band. With guest vocal percussionist Ed Chung of Duwende.